Factory-built chimney



April 30, 1963 J. H. CARR 3,087,408

FACTORY-BUILT CHIMNEY Filed Oct. 24, 1960 3 Sheets-Sheet l INVENTOR.JOA/IV H. CAP/Z2 BYWG? M A TTOR/VE rs April 30, 1963 .1. H. CARRFACTORY-BUILT CHIMNEY 5 Sheets-Sheet 2 Filed Oct- 24. 1960 IN VEN TOR:Jay/v A (A 2/2 A T TORNE Y5 April 30, 1963 J. H. CARR FACTORY-BUILTCHIMNEY 3 Sheets-Sheet 3 Filed Oct. 24, 1960 IN V EN TOR. JOHN #0122 4&4A TTORNEK? Staes Uite This application is a continuation-impart of myapplication Serial No. 35,651 filed June 13, 1960'.

This invention relates to a factory-built chimney of sheetmetalconstruction and more particularly relates to an insulated chimney foruse with gas, liquid and solid fuel-fired equipment wherein the normalflue temperature may be as high a 1400 F. While intermittenttemperatures may rise to 1700 F.

Flues which heretofore have been proposed have not been fullysatisfactory. One type is of all metal construction but it has beennecessary to assemble each of the pipe sections on the job. Thus, it wasup to the workmen to assemble an inner pipe, spacers, outer pipes or thelike, with the possibility of error in assembly. Further, after suchflues are assembled, it is impossible to inspect the inner construction.Another type of factory chimney utilizes a granular insulation which maysettle or which can become moist and freeze.

In accordance with the present invention a prefabricated factory chimneyis provided of sheet-metal construction having three or four concentricpipes wherein the inner pipe serves as a conduit for the hot gases to beexhausted and wherein the annular spaces between the plurality of pipesconvey air upwardly by convection to produce a cooling eflect. The outerpipes also serve as a thermal shield. Thus, the outer wall of thechimney is maintained at a safe temperature.

According to one aspect of this invention, a structure is provided fordischarging the hot vent gas into the open through one orifice whileother orifices spaced below the gas discharge orifice serve to dischargethe cooling air whereby the flow of cooling air is not influenced by theflow of the vent gas.

In accordance with another aspect of the present invention, base platesare provided of rigid structure which are easy to install and whichprovide a completely fire-safe structure.

In the drawings forming part of this application:

FIGURE 1 is a side elevation in section of a complete chimneyconstructed in accordance with .the present invention.

FIGURE 2 is a partial plan view of an end plate.

FIGURE 3 is an enlarged partial view, partly in section, showing twoflue pipes about to be joined.

FIGURE 4 is a perspective view of one form of base or support used incombination with the chimney of the present invention.

FIGURE 5 is a perspective View of another form of base member.

FIGURE 6 is a perspective view, partly cut away, of a flue pipe made inaccordance with the present invention.

Referring now to the drawings by reference characters, and referringparticularly to FIGURES l and 2 there is shown a chimney structurehaving two sections of pipe generally designated 7 and 9. Although twosections of pipe have been shown, it will be obvious that only a singlesection might be employed or that more than two sections might beemployed. Each of the chimney sections consists of an inner pipe 11having a flared upper end as at 13. It will be noted that the flared end13 receives the downturned rim of a ring 21 (hereinafter described) andthat the outer surface of the rim is adapted to fit over the outside ofa similar pipe 11 so that a multiplicity of sections can be coupledtogether. Surrounding the first pipe 11 is the second pipe 15, the thirdpipe 17 and the fourth pipe 19. In many instances only three pipes arenecessary so that the pipe 17 can be eliminated. This form of structureis shown in FIG- URE 6. In order to hold the pipes concentric, an upperor male annular ring 21 and a lower or female annular ring, bothsuitably of pressed metal, are provided. The rings 21 and 25 mate witheach other as is hereinafter described in detail. Holes 28 and 30 andslots 27 are provided for the free circulation of air. It will be notedthat in forming the slots 27 tongues of metal 26 are left attached tothe ring 21 at each end of the slot. These tongues are then bentinwardly on the lines 29' forming the fingers 28 which serve to retainthe pipe 15 and, if used, the pipe 17 in place. Similar fingers are usedon the bottom rings and are described in detail hereinafter. The rings21 and 25 can be fastened to the pipes 11, 15, 17 and 19 by rivets,welding or may be merely pressed together. Normally, only the outer pipe19 is riveted to the rings, the other pipes being locked in place by therings and fingers.

In order to permit the pipe to pass through a floor opening, an annularring 31 is provided having a suitable opening to receive the outer pipe19.

The cap assembly proper consists of a rectangular outer wall 33 to whichis attached a lower cap 35 which is somewhat larger in size than thewall 33' and which has openings 37 located near the bottom thereof.Mounted over the lower cap 35 is a top cap 39 which has a downturned rim41 thereon. The top cap 39 is supported from the lower cap 35 by meansof a series of pillars 43 which forms a discontinuous support for thetop 3 9 and which permits gas to pass between the lower cap 35 and thetop cap 39'. The lower cap 35 has an upper plate 45 having a hole at thecenter thereof which supports a small inner pipe 47 which mates with theouter surface of the inside rim of ring 21 and can enter pipe 11 ifnecessary as previously described.

One form of support or base structure is shown in FIG- URE 4 andconsists of a rectangular pan-like member 49 having a bottom 50 andupstanding side walls 53. Attached to the side walls 53' is the flangemembers 55 which can be pressed upwardly against joists 57 as is shownin FIGURE 1. The flange 55 has nail holes 61 therein so that the bottomsupport can be nailed to the joists 57 as is shown in FIGURE 1. Further,straps of metal, such as plumbers tape 63-, are fastened near the fourcorners of the device which can be brought over the joists and nailed asat 65. The bottom of the member 50 is provided with a ring, similar tothat shown in FIG- URE 2, designated 67. This is held by the rim 52which is held under the spacer plate 51 on the base 50. A series ofopenings 69 corresponding to holes 28 and 30 are provided in the bottom50 of the base, so that air can circulate freely upwards. The bottom'50- and ring 67 serve to retain a short length of pipe 68 which can becoupled to a conventional T 70.

The form of support shown in FIGURE 4 is for heavy duty applicationswherein a large number of pipe sections must be supported. In manyinstances, such as when only a few pipe sections need be supported, asimpler base member such as is shown in FIGURE 5 may be employed. InFIGURE 5 the base, generally designated 90, is provided with side walls91 and bottom 92. Attached to the walls 91 are angle members 93 whichserve to locate the base with respect to a framework of joists (notshown). Nail holes 94 are provided for nailing the base to the joists.Set within the bottom 92 is a ring 95 which is adapted to receive andsupport the bottom of a section of pipe.

The device is assembled as is shown in FIGURE 1. Flue gas is dischargedthrough the center pipe 11 through the top cap 39 around the pillars 43.Air is drawn upwardly by convection through the openings 69, through theholes 28 and 30, the slots 27 and the spaces formed between the pipes11, 15, 17and 19, respectively, and will be discharged through theopenings '37.

Turning now-to a description of the pipe sections proper and referringpatricularly to FIGURES 3 and 6, the pipes 11, 15, 17 and 19 are heldinconcentric relationship by an upper ring 21 and a lower ring 25. Thepipe 17 may or may not be used. Each of the rings is preferably made ofa single piece of drawn metal. The upper or male ring 21 has adownturned outer rim 71 and a shorter downturned inner rim. 72. Thedownturned rim 71 is riveted to the pipe 19 by means of the rivets 73.Around the periphery of the rim 71 is a series, preferably four, ofarcuate beads 74. The lower or female ring 25 similarly has an outerdownturned rim 75 and a short inner downturned rim 76. The outer rim 75has a shoulder 77 thereon so that the rim has one portion of smallerdiameter to which the pipe19 is riveted by the rivets 78. The inner pipe11 has a bead 79 thereon which engages the ring 25 holding the innerpipe firmly in place. The ring 25 has an annular groove 80 near its edgeand has a series of slots 81 leading from the groove 80 to the outer.edge. The number of slots 81 will, of course, correspond in number andplacement with the beads 74. Of course, the rings 21 and 25 have theholes 28 and 30 and the slots 27 and the fingers 28 previouslydescribed.

In order to lock two mating pipe sections together, as is shown indetail in FIGURE 3, thebeads 74 are placed adjacent to the slots 81 andthe two Pipes forced together. When the beads 74 reach the groove 80,the pipes are given a slight relative turning movement, locking the twosections firmly together. 7

Obviously many modifications and variations of the invention ashereinbefore set forth maybe made without departing from the spirit andscope thereof, and therefore only such limitations should be imposed asare indicated in the appended claims.

Thestructure of the present invention meets underwriters requirementsfor hightemp'ert'ure installations and provides a relatively low costreplacement for masonry structures.

I claim:

1. A pipe section adapted for use in a prefabricated,

factory built chimney comprising an inner pipe and an outer pipeconcentric therewith, flat perforated rings at each end of said pipesection holding the inner and outer pipes concentric, at least oneadditional pipe disposed between said inner and outer pipes, saidadditional pipe being concentric therewith, fastening means on each ofsaid rings to hold said additional pipe in spaced relationship to theinner and outer pipes, one of said rings forming a male connection atone end of said pipe section and at the opposite end of said pipesection a female connection formed by the outer pipe.

2. The structure of claim 1 wherein the fastening means on said ringscomprises a series of struck-out fingers extending inwardly from saidrings said fingers engaging said additional pipe.

3. The structure of claim 1 wherein the ring forming the male connectionhas a plurality of struck-out beads thereon and wheerin the female endhas an annular groove formed at the end thereof with a series ofcorresponding slots leading from said groove to the end of the ringwhereby said beads can be forced into said slots until the rings are inengagement and turned relative to each other whereby said beads will beengaged by said groove.

4. The structure of claim 3 wherein there are four equally spaced beadsand slots.

5. The structure of claim 1 wherein a pipe section is held by a baseplate, said base plate being in the form of a rectangular pan havingupstanding side walls, means on said side walls for attaching the baseto a frame member, and the bottom of said base plate having an annularring adapted to engage and hold a female ring on a pipe section.

6. The structure of claim 1 wherein a top structure is providedcomprising a lower cap and an upper cap, means whereby gas in the innerpipe can pass in the space between the upper cap and the lower cap, andmeans whereby rising air will be discharged from the spaces between theinner and outer pipes, under the lower cap.

References Cited in the file of this patent UNITED STATES PATENTS499,856 Schaffer June 20, 1893 2,054,859 Kitching Sept. 22, 19362,650,112 Kinread Aug. 25, 1953 2,764,972 Ryder Oct. 2, 1956 2,856,837Thulman Oct. 21, 1958

1. A PIPE SECTION ADAPTED FOR USE IN A PREFABRICATED, FACTORY BUILTCHIMNEY COMPRISING AN INNER PIPE AND AN OUTER PIPE CONCENTRIC THEREWITH,FLAT PERFORATED RINGS AT EACH END OF SAID PIPE SECTION HOLDING THE INNERAND OUTER PIPES CONCENTRIC, AT LEAST ONE ADDITIONAL PIPE DISPOSEDBETWEEN SAID INNER AND OUTER PIPES, SAID ADDITIONAL PIPE BEINGCONCENTRIC THEREWITH, FASTENING MEANS ON EACH OF SAID RINGS TO HOLD SAIDADDITIONAL PIPE IN SPACED RELATIONSHIP TO THE INNER AND OUTER PIPES, ONEOF SAID RINGS FORMING A MALE CONNECTION AT ONE END OF SAID PIPE SECTIONAND AT THE OPPOSITE END OF SAID PIPE SECTION A FEMALE CONNECTION FORMEDBY THE OUTER PIPE.